please solve the question it is urgent
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Step-by-step explanation:
i) 16x² - 40x + 25
= 16x² - 20x -20x +25
= 4x(4x - 5) -5(4x -5)
= (4x -5)(4x-5)
ii) 42 - x - x²
= x² + x - 42
= x² +7x - 6x -42
= x(x +7) -6(x + 7)
= (x-6)(x+7)
iii) x² -8x -20
= x² -10x + 2x -20
= x(x-10) +2(x-10)
= (x+2)(x-10)
iv) x² -8x +15
= x² -5x -3x +15
= x(x-5) -3(x -5)
= (x-3)(x-5)
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