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A student opens a mathematics book to two facing pages. The product of the pages is 420. Find the page numbers.
 2 years ago
 2 years ago
A student opens a mathematics book to two facing pages. The product of the pages is 420. Find the page numbers.
 2 years ago
 2 years ago

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ravi623Best ResponseYou've already chosen the best response.2
let the first page no be =x so the second page no will be =x+1 so (x+1)x=420 solve this equation for x, you will find the answer
 2 years ago

RegulatorsBest ResponseYou've already chosen the best response.0
Ok, ravi623. I come up with x^2=420x? But what do I do after this?, because x is negative do I need to make it positive first? 1(x420) instead?
 2 years ago

ravi623Best ResponseYou've already chosen the best response.2
factorize the the 420=21X20 (x+1)x=420 becomes x^2+x420=0, this becomes a quadratic equation so x^2+21x20x420=0 x(x+21)20(x+21)=0 (x20)(x+21)=0 so x=20, x=21 but no of pages can not be negative ,so x=20 is the right answer so first page no is 20 and other pages no is 20+1=21
 2 years ago

RegulatorsBest ResponseYou've already chosen the best response.0
Thank you, I understand
 2 years ago
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