Question

dút gọn

a, (x+2)^2-(x-3)^2=?

b, (x+3)(x-1)=(5-x)^2

Answer 1

a) \(x^2+4x+4-x^2+6x-9=10x-5\)

b) \(\left(x+3\right)\left(x-1\right)+\left(5-x\right)^2=x^2+2x-3+x^2-10x+25=2x^2-8x^2+22\)

Answer 2

sai chính tả

Answer 3

a) \(\left(x+2\right)^2-\left(x-3\right)^2=0\)

\(\Leftrightarrow\left(x+2-x+3\right)\left(x+2+x-3\right)=0\)

\(\Leftrightarrow2x-1=0\)

\(\Leftrightarrow x=\dfrac{1}{2}\)

b) \(\left(x+3\right)\left(x-1\right)=\left(5-x\right)^2\)

\(\Leftrightarrow x^2+2x-3=x^2-10x+25\)

\(\Leftrightarrow12x-28=0\)

\(\Leftrightarrow x=\dfrac{7}{3}\)

Answer 4

b,(x+3)(x-1)+(5-x)^2

Answer 5

ghi đề chả rõ ghì hết

thấy cây b tưởng giải pt