Solve quadratic formula x-2x-15=0 the first x is squared

Mathematics

2 answers:

solniwko [45]3 years ago

8 0

$x^2-2x-15=0\\
x^2-5x+3x-15=0\\
x(x-5)+3(x-5)=0\\
(x+3)(x-5)=0\\
x=-3 \vee x=5
$

Oduvanchick [21]3 years ago

6 0

You said that x² - 2x - 15 = 0 .

You could factor the left side:

(x + 3) (x - 5) = 0

This equation is true if either of the factors is zero.

First factor:
x + 3 = 0
x = -3

Second factor:
x - 5 = 0
x = 5

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