12
√7(5√7+8)-(√7+4)² = √7*5√7+8√7-(√7²+2*√7*4+4²)=5*7+8√7-(7+8√7+16)=
35+8√7-7-8√7-16=12
√7(5√7+8)-(√7+4)^2=5×7+8√7-7-8√7-16=35-7-16=12
12
√7(5√7+8)-(√7+4)² = √7*5√7+8√7-(√7²+2*√7*4+4²)=5*7+8√7-(7+8√7+16)=
35+8√7-7-8√7-16=12
√7(5√7+8)-(√7+4)^2=5×7+8√7-7-8√7-16=35-7-16=12