Question

Ai có thể làm từ câu 16-29 đc ko

Answer 1

16. 25-x²=(5-x)(5+x)

17. -144+y²=(y-12)(y+12)

18. -196+4x²=(2x-14)(2x+14)=2.(x-7).2(x+7)=4(x-7)(x+7)

19. 25x²-225²=(5x-225)(5x+225)

20.2⁶-47x²=\(\left(8-\sqrt{47}x\right)\left(8+\sqrt{47}x\right)\)

21.-4⁸+36y²=(6y-256)(6y+256)

Answer 2

26: \(\left(x+3\right)^2-16=x^2+6x+9-16=x^2+6x-7\)

27: \(64+\left(-49y^2\right)=\left(8-7y\right)\left(8+7y\right)\)

28: \(4x^2-\left(y+2\right)^2=\left(2x-y-2\right)\left(2x+y+2\right)\)