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Mathematics 8 Online
OpenStudy (anonymous):

Multiply. (2√5 - 1)(3√5 + 4)

OpenStudy (anonymous):

Choices: 26 - 11√5 26 + 5√5 34 - 11√5 34 + 5√5

OpenStudy (anonymous):

we have = (2 root 5 -1 ) (3 root 5 - 4) => 2x3 x root 5 x root 5 - 3 root 5 - 8 root 5 + 4 => 2x3x5 - 11 root 5 + 4 => 30+4 - 11 root 5 => 34 - 11 root 5 = ans. (sqrt here means ROOT)

OpenStudy (anonymous):

thanks(:

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