Solve the Quadratic Equation: x^2 + 10x - 24 = 0

Question

x2+10x24=0 x^2+10x-24=0

Video Solution

Solution Steps

00:00 Find X
00:03 We'll break it down using trinomial, examining coefficients
00:07 We want to find 2 numbers that sum to B (10)
00:13 and their product equals C (-24)
00:21 These are the matching numbers, let's substitute in parentheses
00:30 Find what zeroes each factor
00:42 And this is the solution to the question

Step-by-Step Solution

Let's observe that the given equation:

x2+10x24=0 x^2+10x-24=0 is a quadratic equation that can be solved using quick factoring:

x2+10x24=0{??=24?+?=10(x+12)(x2)=0 x^2+10x-24=0 \longleftrightarrow\begin{cases}\underline{?}\cdot\underline{?}=-24\\ \underline{?}+\underline{?}=10\end{cases}\\ \downarrow\\ (x+12)(x-2)=0 and therefore we get two simpler equations from which we can extract the solution:

(x+12)(x2)=0x+12=0x=12x2=0x=2x=12,2 (x+12)(x-2)=0 \\ \downarrow\\ x+12=0\rightarrow\boxed{x=-12}\\ x-2=0\rightarrow\boxed{x=2}\\ \boxed{x=-12,2} Therefore, the correct answer is answer B.

Answer

x=2,x=12 x=2,x=-12