Question

(х – 4)(х + 5) = x2 - 13

Answer 1

Ответ:

х=7

Пошаговое объяснение:

(x-4)(x+5)=x^2-13

x^2+5x-4x-20=x^2-13

x-20=-13

x=7

Answer 2

Let's simplify the given expression step by step:

(х – 4)(х + 5) = x^2 - 13

To expand the left side of the equation, we can use the distributive property:

х * х + х * 5 - 4 * х - 4 * 5 = x^2 - 13

Simplifying further:

x^2 + 5x - 4x - 20 = x^2 - 13

Combine like terms:

x^2 + x - 20 = x^2 - 13

Now, we can eliminate the x^2 terms by subtracting x^2 from both sides:

x^2 - x^2 + x - 20 = x^2 - x^2 - 13

Simplifying:

x - 20 = -13

To isolate x, we can add 20 to both sides:

x - 20 + 20 = -13 + 20

Simplifying:

x = 7

Therefore, the solution to the equation (х – 4)(х + 5) = x^2 - 13 is x = 7.