Question

r^2-13r+30=0 factorise

Answer 1

r² - 13r + 30 = 0

r² - (10 + 3)r + 30 = 0

r² - 10r - 3r + 30 = 0

r (r - 10) - 3 (r - 10) = 0

(r - 3) (r - 10) = 0

r - 3 = 0 or r - 10 = 0

r = 3 or r = 10

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Answer 2

ANSWER ✔✔↙️↙️

r^2-13r+30

r^2-10r-3r+30

r(r-10)-3(r-10)

(r-3)(r-10)

r=3 and r=10

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