Factorise
(i) 42 - x - x²
(ii) 16x² + 25 - 40x
Answers
Answer:
a(3a^2+4-3)
Step-by-step explanation:
ANSWER:
1. 42 - x - x^2 = -x^2 - x + 42 = -x^2 - 7x + 6x + 42 = - x(x+7) + 6(x+7) = (-x+6)(x+7) 2.16^2+25-40 =16^2-40x+25 =16x^2-20x-20x+25 =4x(4x-5)-5(4x-5) =(4x-5)(4x-5) =(4x-5)^2 =(4x-5)(4x-5)
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