Question

Expand: ( 3x - 2y - 7)².​

Answer 1

Answer:3x²+2y²+49-2√6xy+14√2y-14√3x

(a+b+c)²=a²+b²+c²+2ab+2bc+2ca

(√3x-√2y-7)²

a=√3x,b=-√2y,c=-7

(√3x-√2y-7)²= (√3x)²+(-√2y)²+(-7)²+2(√3x)(-√2y)+2(-√2y)(-7)+2(-7)(√3x)

                   =3x²+2y²+49-2√6xy+14√2y-14√3x

(∵√3×√3=3,√2×√2=2,√3×√2=√3×2=√6)

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