If A 2x ^ 2 = 5, B = x ^ 2 - 3x + 6 and C =x^ 2 -4x+2 find A + 2B + 2C
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Substituting a=2, b=3 , c=−2 in the given expression, we get
a2+b2+c2−2ab−2bc−2ca+3abc
=(2)2+(3)2+(−2)2−2×2×3−2×3×−2−2×−2×2+3×2×3×−2
=4+9+4−12+12+8−36
=25−36=−11
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