A²-28=3a this has to be answed by factoring but idk how... help >_

(a + 4)(a - 7)

Step-by-step explanation:

a^2 - 3a - 28

Factors of 28: 1, 2, 4, 7, 14, 28

4 - 7 = -3

(a + 4)(a - 7)

now to check:

(a • a) + (a • -7) + (4 • a) + (4 • -7)

(a^2) + (-7a) + (4a) + (-28)

a^2 - 7a + 4a - 28

a^2 - 3a - 28

answer is 8x+24

area of vanessa's patio = length × width

given, length = (3x² + 5x + 10)

width = (x² - 3x - 1)

area of vanessa's patio = (3x² + 5x + 10)(x² - 3x - 1)

= 3x²(x² - 3x - 1) + 5x(x² - 3x - 1) + 10(x² - 3x - 1)

= 3x⁴ - 9x³ - 3x² + 5x³ - 15x² - 5x + 10x² - 30x - 10

= 3x⁴ - 4x³ - 8x² - 35x - 10

hence, expression of vanessa's patio = (3x⁴ - 4x³ - 8x² - 35x - 10)