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16\left(x^{2}\right)^{2}+56x^{2}+49
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(4x^{2}+7\right)^{2}.
16x^{4}+56x^{2}+49
To raise a power to another power, multiply the exponents. Multiply 2 and 2 to get 4.
16\left(x^{2}\right)^{2}+56x^{2}+49
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(4x^{2}+7\right)^{2}.
16x^{4}+56x^{2}+49
To raise a power to another power, multiply the exponents. Multiply 2 and 2 to get 4.