Question

produtos notáveis alguém me ajuda por favor
$(a {}^{2} - 4y) {}^{2}$
$(ax + b)(ax - b)$
$(a {}^{3} + b ^{3} )^{2}$
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Answer 1

$\boxed{\begin{array}{l}\tt a)~\sf(a^2-4y)^2=(a^2)^2-2\cdot a^2\cdot4y+(4y)^2\\\sf (a^2-4y)^2=a^4-8a^2y+16y^2\\\tt b)~\sf(ax+b)(ax-b)=(ax)^2-(b)^2\\\sf(ax+b)(ax-b)=a^2x^2-b^2\\\tt c)~\sf(a^3+b^3)^2=(a^3)^2+2a^3b^3+(b^3)^2\\\sf(a^3+b^3)^2=a^6+2a^3b^3+b^6\end{array}}$