Question

who two tell first i add one who first i add to brainless number​

Answer 1

Answer:

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Q1.What must be added to${x}^{2}y - y - 3x + 4$ to obtain${ - 7x}^{2}y + 8x - 5$

Q2.Half of a number is 45 less than the number.Find the number.

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1Ans.Let the no. that should be added be a

A/Q

$({x}^{2}y - y - 3x + 4)+(a)={ - 7x}^{2}y + 8x - 5\\</p><p>=>{ - 7x}^{2}y + 8x - 5-(-{x}^{2}y - y - 3x + 4)=a\\</p><p>=>{ - 7x}^{2}y + 8x - 5+{x}^{2}y +y +3x - 4=a\\</p><p>=>{ - 7x}^{2}y+{x}^{2}y +8x+3x+y-5-4=a\\</p><p>=>a={ -6x}^{2}y+11x+y-9$

2Ans.

A/Q

1/2ofx=x-45

=>x/2=x-45

=>2x-x/2=45

=>x=45×2

hence,the no.is 90

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