84 - 2r - 2r square.
factorise it plz.
Answers
Answered by
2
Given quadratic expression in variable r is
84-2r-2r²
= 2(42-r-r²) /* Taking 2 common */
= 2( 42 - 7r + 6r - r²) /* splitting the middle term */
= 2[7(6-r)+r(6-r)]
= 2(6-r)(7+r)
Therefore,.
2, (6-r) and (7+r) are factors of given quadratic expression.
Answered by
1
Answer:
-2r² -2r +84 = 0
=> r² +r -42= 0
r² +7r -6r -42=0
r(r+7) -6(r+7) =0
(r-6)(r+7)= 0
r=6 or -7
for doubt what's app 9467169711
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