4r²— 49=0 in quadratic equation and working
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6
Answer:
r = -7/2 or r = 7/2
Step-by-step explanation:
4r² - 49 = 0
Rewriting the equation in the form of a² - b²
4r² - 49 = 0
(2r)² - (7)² = 0
Apply the property a² - b²= (a + b)(a - b)
(2r)²- (7)²= 0
(2r + 7)(2r - 7) = 0
Apply the zero property
(2r + 7) (2r - 7) = 0
2r + 7 = 0 or 2r - 7 = 0
2r = -7 or 2r = 7
r = -7/2 or r = 7/2
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