Question

what is the product (9t-4)(-9t-4)

Answer 1

(9t-4)(-9t-4)
9t(-9t-4)-4(-9t-4)
-81t²-36t+36t-16
-81t²-16=0
-81t²=16
t²=16/-81
t=√16/-81
t=4/√-81

Answer 2

$\huge\boxed{\texttt{\fcolorbox{Red}{aqua}{Hey Mate!!!!}}}$

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Here is your answer.

Chapter- Algebraic expression

Topic- Multiplying a binomial by a binomial

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

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