Question

(2a+3y)ao quadrado=




(5m-n)(5m+7m)=


(4+x)(4-x)=

Answer 1

1°
$(2a+3y)^2=4a^2+12ay+9y^2$

2°
$(5m-n)(5m+7m)\\25m^2+35m^2-5mn-7mn\\60m^2-12mn$

3°

$(4+x)(4-x)=4^2-4x+4x-x^2=16-x^2$