Math, asked by aakriti83, 1 month ago

84-2r-2r² factorisation ​

Answers

Answered by Athul4152
1

84 - 2r - 2r^2 =. - 2r^2 - 2r + 84

= 2r^2 + 2r - 84

2r^2 + 2r -84

a = 2 , b = 2 , c = -84

By quadrilateral equation

x =. - 2 +/- [ 2^2 - (4 × 2× (-84))] / (2×2)

=. -2 +/- [4 + 672] / 4

=. - 2+/- 26 / 4

===> -2 + 26 / 4. =====> -2 - 26 / 4

= 24 / 4. =. -28 / 4

= 6. = -7

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