Multiply out brackets and simplify $(2sqrta-3sqrtb) (sqrta + sqrtb)$ ?

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Answer 1 · 2017-10-14T17:44:30

$2a-sqrt (ab)-3b$

$(2sqrt a- 3sqrt b)(sqrt a+sqrt b)$
$(2sqrta*sqrta)-3sqrtb*sqrta)+ (2sqrta*sqrtb)-(3sqrtb*sqrtb)$
= $2a-3sqrt(ab)+2sqrt(ab)-3b$
$=2a-sqrt(ab)-3b$

Multiply out brackets and simplify (2sqrta-3sqrtb) (sqrta + sqrtb) (2sqrta-3sqrtb) (sqrta + sqrtb)?