Question

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

(5x - 10)(3x + 6) = 0

(x - 4)(2x - 14) = 0

Answer 1

1) \(\Rightarrow\left[{}\begin{matrix}x=-3\\x=5\end{matrix}\right.\)

2) \(\Rightarrow5\left(x-2\right).3\left(x+2\right)=0\Rightarrow\left[{}\begin{matrix}x=2\\x=-2\end{matrix}\right.\)

3) \(\Rightarrow2\left(x-4\right)\left(x-7\right)=0\Rightarrow\left[{}\begin{matrix}x=4\\x=7\end{matrix}\right.\)

Answer 2

a) 

x+3=0⇔x=-3

x-5=0⇔x=5

b

5x-10=0⇔x=2

3x+6=0⇔x=-2

c) 

x-4=0⇔x=4

2x-14=0⇔x=7

Answer 3

1) ⇒[x=−3x=5⇒[

        [x=−3x=5

2) ⇒5(x−2).3(x+2)=0⇒[x=2x=−2⇒5(x−2).3(x+2)=0⇒[x=2x=−2

3) ⇒2(x−4)(x−7)=0⇒[x=4x=7