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AURORKA [14]
3 years ago
12

What is the product? (9t − 4)(−9t − 4) −81t2 − 16 −81t2 + 16 −81t2 − 72t + 16 −81t2 + 72t + 16

Mathematics
2 answers:
Andrei [34K]3 years ago
7 0

Answer:

Option 2nd is correct

-81t^2+16

Step-by-step explanation:

To find the product of:

(9t-4)(-9t-4)

We can write this as:

-(9t-4)(9t+4)

Using identity rule:

(a+b)(a-b) = a^2-b^2

then;

-((9t)^2-(4)^2)

⇒-(81t^2-16)

Using distributive property i.e, a \cdot (b+c) = a\cdot b+ a\cdot c

-81t^2+16

Therefore, the following given product is, -81t^2+16

Olenka [21]3 years ago
3 0

Answer:

-81t^{2}+16

Step-by-step explanation:

we have

(9t - 4)(-9t - 4)

Applying distributive property

(9t - 4)(-9t - 4)=(9t*-9t)+(9t*(-4))+(-4*(-9t))+(-4*(-4))\\=-81t^{2} -36t+36t+16\\=-81t^{2}+16

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