What is 64 ÷ (15 - 7) x2 - 9 using pemdas
2 answers:
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Answer:
Step-by-step explanation:
Factorise numerator and denominator
x² - 9 ← is a difference of squares and factors in general as
a² - b² = (a - b)(a + b) , then
x² - 9
= x² - 3² = (x - 3)(x + 3)
x² - 3x ← factor out x from each term
= x(x - 3)
Then
= ← cancel common factor (x - 3) on numerator/denominator
=