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\left(\sqrt{3}\right)^{2}a^{2}+3\left(\sqrt{3}-a\right)^{2}
Expand \left(\sqrt{3}a\right)^{2}.
3a^{2}+3\left(\sqrt{3}-a\right)^{2}
The square of \sqrt{3} is 3.
3a^{2}+3\left(\left(\sqrt{3}\right)^{2}-2\sqrt{3}a+a^{2}\right)
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(\sqrt{3}-a\right)^{2}.
3a^{2}+3\left(3-2\sqrt{3}a+a^{2}\right)
The square of \sqrt{3} is 3.
3a^{2}+9-6\sqrt{3}a+3a^{2}
Use the distributive property to multiply 3 by 3-2\sqrt{3}a+a^{2}.
6a^{2}+9-6\sqrt{3}a
Combine 3a^{2} and 3a^{2} to get 6a^{2}.
\left(\sqrt{3}\right)^{2}a^{2}+3\left(\sqrt{3}-a\right)^{2}
Expand \left(\sqrt{3}a\right)^{2}.
3a^{2}+3\left(\sqrt{3}-a\right)^{2}
The square of \sqrt{3} is 3.
3a^{2}+3\left(\left(\sqrt{3}\right)^{2}-2\sqrt{3}a+a^{2}\right)
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(\sqrt{3}-a\right)^{2}.
3a^{2}+3\left(3-2\sqrt{3}a+a^{2}\right)
The square of \sqrt{3} is 3.
3a^{2}+9-6\sqrt{3}a+3a^{2}
Use the distributive property to multiply 3 by 3-2\sqrt{3}a+a^{2}.
6a^{2}+9-6\sqrt{3}a
Combine 3a^{2} and 3a^{2} to get 6a^{2}.