3(x-3)(x+4) +3(x-2)(x-4)=19(x-4)(x-3) by formula method
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Step-by-step explanation:
3(x-3)(x+4) +3(x-2)(x-4)=19(x-4)(x-3)
LHS
3(x-3)(x+4) +3(x-2)(x-4)
=3{x²+(-3+4)x-3×4}+3{x²-(2+4)x+2×4}
=3{x²+x-12}+3{x²-6x+8}
=3x²+3x-36+3x²-18x+24
=3x²+3x²+3x-18x-36+24
=6x²-15x-12
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