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16x^{2}-6x-\left(4x+1\right)^{2}
Use the distributive property to multiply 2x by 8x-3.
16x^{2}-6x-\left(16x^{2}+8x+1\right)
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(4x+1\right)^{2}.
16x^{2}-6x-16x^{2}-8x-1
To find the opposite of 16x^{2}+8x+1, find the opposite of each term.
-6x-8x-1
Combine 16x^{2} and -16x^{2} to get 0.
-14x-1
Combine -6x and -8x to get -14x.
16x^{2}-6x-\left(4x+1\right)^{2}
Use the distributive property to multiply 2x by 8x-3.
16x^{2}-6x-\left(16x^{2}+8x+1\right)
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(4x+1\right)^{2}.
16x^{2}-6x-16x^{2}-8x-1
To find the opposite of 16x^{2}+8x+1, find the opposite of each term.
-6x-8x-1
Combine 16x^{2} and -16x^{2} to get 0.
-14x-1
Combine -6x and -8x to get -14x.