Yr 11 MCAT Algebra Practice 4 1. Solve these equations… a) 5(a – 3) + 1 = 46 b) (a – 5)(a + 3) = 0 c) 13a – 32 = 7a – 8 2. Expand and simplify… a) (a – 11)(a – 2) = b) 7a(a + 3) + 6(a + 4) = 3. Make y the subject of 5x + 6y – 48 = 0 11. Factorise the following… a) 5a2 + 45a + 100 = 3a 2a + 14 6. Write a simplified expression for the perimeter of this triangle… 7. Write a simplified expression for the area of this triangle… c) 8. If the total area is actually 90m2 what is the value of a? 3a – 3b = 36 c) 36a8b7 = 18a7b4 d) 4a3b5c x 7ab3c2 = e) 5a - a = 12 12 9(a – 4)2 + 3 = 84 13. Simplify… a) b) 7a + 9b + a – b + a – 2b = 3a + b = 48 a) 2a2 = 72 b) 2a4 = 128 9. Simplify… a) (2a4)4 = 5. Simultaneous solve for a and b c) 2a2 + 5a + 3 = 12. Solve the following… 4. Solve to find both values of a a2 – 5a - 14 = 0 b) a2 – 81 = 4a5b9 = 14a7b3 b) (4a2)0 = c) a + 2b = 2 5 14. What two numbers add to seventeen but subtract to one? Yr 11 MCAT Algebra Practice 4 1. Solve these equations… 5(a-3)=45 (a-3)=9 a=12 5 or __ -3 b) (a – 5)(a + 3) = 0 a is __ a) 5(a – 3) + 1 = 46 c) 13a – 32 = 7a – 8 13a-7a=-8+32 6a=24 a=4 2. Expand and simplify… 2 a) (a – 11)(a – 2) = a - 11a - 2a + 22 = a2 – 13a + 22 b) 7a(a + 3) + 6(a + 4) = = 7a2 + 21a + 6a + 24 = 7a2 + 27a + 24 3. Make y the subject of 5x + 6y – 48 = 0 6y = -5x + 48 y = -5/6x + 8 4. Solve to find both values of a a2 – 5a - 14 = 0 7 or __ -2 a is __ 4b = 12 b=3 a) 5a2 + 45a + 100 = 2a + 14 6. Write a simplified expression for the perimeter of this triangle… c) 2a2 + 5a + 3 = 3a + ______ 8a + 4 + ______ 2a + 14 ____ = 13a + 18 7. Write a simplified expression for the area of this triangle… 3a – 3b = 36 sub b = 3 into eqn 1. 3a + 3 = 48 3a = 45 a = 15 a2 + 9a + 20 = (a + 4)(a + 5) b) a2 – 81 = (a – 9)(a + 9) (2a + 3 )(a + 1 ) 12. Solve the following… a2 = 36 a = 6 or - 6 a) = 72 a4 = 64 4 b) 2a = 128 a = 4 or - 4 2a2 area (triangle) = 1/2 b x h area (triangle) = 1/2 (2a + 14) x 3a area (triangle) = (a + 7) x 3a = 3a2 + 21a c) 8. If the total area is actually 90m2 what is the value of a? 3a2 + 21a = 90 3a2 + 21a – 90 = 0 a2 + 7a – 30 = 0 (a + 10)(a - 3 ) = 0 3 a is -10 __ or __ b) 7a + 9b + a – b + a – 2b = 9a - 6b 5. Simultaneous solve for a and b - (3a – 3b = 36) 3a 9. Simplify… a) (2a4)4 = 16 a16 (a - 7 )(a + 2) = 0 3a + b = 48 11. Factorise the following… c) 36a8b7 = 2a b3 18a7b4 9(a – 4)2 + 3 = 84 9(a – 4)2 = 81 (a – 4)2 = 9 a – 4 = 3 or - 3 a = 7 or 1 13. Simplify… a) 4a5b9 = 14a7b3 2b6 7 a2 . b) (4a2)0 = 1 5a + 4b c) a + 2b = 10 10 2 5 = 5a+4b 10 . . . d) 4a3b5c x 7ab3c2 = 28a4 b8 c3 e) 5a - a = 4a = a 12 3 12 12 . . 14. What two numbers add to seventeen but subtract to one? a + b = 17 - (a - b = 1 ) 2b = 18 b=9 a + 9 = 17 a=8