Question

Calculati:
a) $x^{2} -144$ =
b) $16a^{2} -40ab+ 25 b^{2}$ =
c) $x^{2} +8x+16$ =
d) $(2a+3) (2a-3)$ =
e) $7 x^{2} - y^{2}$ =

Answer 1

[tex]a)x^2-144=(x-12)(x+12)\\ b)16a^2-40ab+25b^2=(4a-5b)^2\\ c)x^2+8x+16=(x+4)^2\\ d)(2a+3)(2a-3)=4a^2-9\\ e)7x^2-y^2=(x\sqrt7+y)(x\sqrt7-y)[/tex]