Expand (4√3 − 3√5)^2
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(4√3 − 3√5)^2
= 4√3 - 3√5 * 4√3 - 3√5
= 4√3 ( 4√3 - 3√5 ) - 3√5( 4√3 - 3√5)
= 16(3) - 12√15 - 12√15 + 9(5)
= 48 + 45 - 24√15
= 93 - 24√15
Hope helped!