# How do you solve the equation by factoring or the quadratic formula x^2+ 3x - 28 = 0?

Jun 26, 2015

#### Answer:

Find the factors of 28 that will subtract to give 3 i.e. 4 and 7. Then factorise the expression

#### Explanation:

${x}^{2} + 3 x - 28 = \left(x + 4\right) \left(x - 7\right)$
Therefore $x = - 4$ or $x = 7$