plz tell me these 2 questions with full method plz guys help
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1+6ab+9a^2b^2
= 1+2×3ab+(3ab)^2
= (1+3ab)^2
=(1+3ab)(1+3ab)
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8l^3 - 36l^2m +54lm^2-27m^3
=(2l)^3 -3×(2l)^2×3m + 3×2l×(3m)^2 -(3 m)^3
=(2l-3m)^3
= 1+2×3ab+(3ab)^2
= (1+3ab)^2
=(1+3ab)(1+3ab)
______________________
8l^3 - 36l^2m +54lm^2-27m^3
=(2l)^3 -3×(2l)^2×3m + 3×2l×(3m)^2 -(3 m)^3
=(2l-3m)^3
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