Question

expand this please (7x+9y+5z)2​

Answer 1

Step-by-step explanation:

(a+b+c)2= a2+b2+c2+2ab+2bc+2ca

(7x+9y+5z)2= (7x)2+(9y)2+(5z)2+(2×7x×9y)+(2×9y×5z)+(2×5z×7x)=

(7x+9y+5z)2= (49x)2+(81y)2+(25z)2+(126xy)+(90yz)+(70zx). Ans