Question

(×+7) (×-5)=??Answer plz it's very urgent​

Answer 1

(х + 7)(х - 5) = х · х + 7 · х - 5 · х - 5 · 7 = х² + 7х - 5х - 35 =

= х² + 2х - 35 = 0 - это квадратное уравнение

D = b² - 4ac = 2² - 4 · 1 · (-35) = 4 + 140 = 144

√D = √144 = 12

х₁ = (-2-12)/(2·1) = (-14)/2 = -7

х₂ = (-2+12)/(2·1) = 10/2 = 5

Ответ: (-7; 5).

Answer 2

It looks like you want to multiply the expression (x + 7) by (x - 5). To do that, you can use the distributive property, also known as FOIL (First, Outer, Inner, Last). Here's the step-by-step calculation:

(x + 7)(x - 5) = x(x) + x(-5) + 7(x) + 7(-5)

Now, let's simplify each term:

1. x(x) = x^2
2. x(-5) = -5x
3. 7(x) = 7x
4. 7(-5) = -35

So, when you add these simplified terms together, you get:

x^2 - 5x + 7x - 35

Now, combine the like terms:

x^2 + 2x - 35

So, (x + 7)(x - 5) simplifies to x^2 + 2x - 35.