Question

viết các biểu thức dưới dạng tích

a) 16-\(x^2\)

b) \(4x^2-9y^2\)

c) \(a^4-25\)

d) \(\left(a+ b\right)^2-4\)

Answer 1

a) \(16-x^2\)

\(=\left(4\right)^2-x^2\)

\(=\left(4-x\right)\left(4+x\right)\)

b) \(4x^2-9y^2\)

\(=\left(2x\right)^2-\left(3y\right)^2\)

\(=\left(2x-3y\right)\left(2x+3y\right)\)

c) \(a^4-25\)

\(=\left(a^2\right)^2-5^2\)

\(=\left(a^2-5\right)\left(a^2+5\right)\)

d) \(\left(a+b\right)^2-4\)

\(=\left(a+b\right)^2-2^2\)

\(=\left(a+b-2\right)\left(a+b+2\right)\)

Answer 2

a. \(16-x^2=4^2-x^2=\left(4-x\right)\left(4+x\right)\)

b. \(4x^2-9y^2=\left(2x\right)^2-\left(3y\right)^2=\left(2x-3y\right)\left(2x+3y\right)\)

c. \(a^4-25=\left(a^2\right)^2-5^2=\left(a^2-5\right)\left(a^2+5\right)\)

d. \(\left(a+b\right)^2-4=\left(a+b\right)^2-2^2=\left(a+b-2\right)\left(a+b+2\right)\)TK MIK NHA