Factorise this..
-21+10r-r²
only correct answers pls
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Factorise this..
-21+10r-r²
only correct answers pls
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Step-by-step explanation:
-r²+10r-21
-r²+7r+3r-21
r(-r+7)-3(-r+7)
(r-3)(-r+7)
Answer:
(7+r)(3-r)
Step-by-step explanation:
-21+10r-r² = -21+7r+3r-r²
= 7(3-r)+r(3-r)
= (7+r)(3-r)