please solve question12
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Answer:
-l²(m²-n²)-p²(l²-m²)+n²(p²-l²)+m²(n²-p²)=(-9)
Step-by-step explanation:
l=1, m=(-2), n=(-1), p=2
-l²(m²-n²)-p²(l²-m²)+n²(p²-l²)+m²(n²-p²)
=-(1)²{(-2)²-(-1)²}-(2)²{(1)²-(-2)²}+(-1){(2)²-(1)²}+(-2)²{(-1)²-(2)²}
=(-1)(4-1)-4(1-4)+(-1)(4-1)+4(1-4)
=(-1)(3)-4(-3)+(-1)(3)+4(-3)
=(-3)-(-12)+(-3)+(-12)
=(-3)+12-3-12
=(-3)-3+12-12
=(-9)
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