Question

Factorise, check by using multiplication a-7a+12​

Answer 1

Explanation:

Sum = -7

Product = 12

Factors = (-3) ; (-4) { (-3) * (-4) = 12 and (-3) + (-4) = -7}

a² - 7a + 12 = a² -3a - 4a + (-3)(-4)

= a(a - 3) - 4(a - 3)

= (a - 3)(a - 4)