Answer:
(a + 4)(a - 7)
Explanation:
a^2 - 3a - 28
Factors of 28: 1, 2, 4, 7, 14, 28
4 - 7 = -3
now to check:
(a • a) + (a • -7) + (4 • a) + (4 • -7)
(a^2) + (-7a) + (4a) + (-28)
a^2 - 7a + 4a - 28
(a+4)(a-7)
Bring 3a to the left and equate it to zero. Using the product sum method find 2 numbers, which give the product when multiplied and give the sum when added. Use them to factor out
5.7m questions
7.5m answers