Simplify (7√5+5√3) (7√5-√3)
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(7√5 + 5√3) (7√5 - 5√3)
= {(7√5)² - (5√3)²}
= {49(5) - 25(3)}
= 245 - 75
= 170
if it is (7√5 + 5√3) (7√5 - √3)
= 7√5(7√5 - √3) + 5√3(7√5-√3)
= 49(5) - 7√15 + 35√15 - 5(3)
= 245 + 28√15 - 15
= 230 + 28√15
= {(7√5)² - (5√3)²}
= {49(5) - 25(3)}
= 245 - 75
= 170
if it is (7√5 + 5√3) (7√5 - √3)
= 7√5(7√5 - √3) + 5√3(7√5-√3)
= 49(5) - 7√15 + 35√15 - 5(3)
= 245 + 28√15 - 15
= 230 + 28√15
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