Question

ab(a2 + b2 - c2) - bc(c2 - a2 - b2) + ca(a2+b2 -c2)​

Answer 1

Step-by-step explanation:

$= {a}^{2} b2 + a {b}^{2} 2 - abc2 - b {c}^{2} 2 + abc2 + {b}^{2} c2 + c {a}^{2} 2 + abc2 - a {c}^{2} 2 \\ = {a}^{2} b2 + a {b}^{2} 2 - b {c}^{2} 2 + {b}^{2} c2 + c {a}^{2} 2 + abc2 - a {c}^{2} 2$