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Mathematics: Post your doubts here!

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How do i know that it is the x-axis invariant, and if the triangle shears to the left side, the answer will still be the same. Any tips?
 

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Please help with Q.9,(b),(i) and (ii)
 

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first you have to solve the 2 equations in that 'substitution method' and find the values of a and of b. then put the values in the expression a^2 + b^2
But the substitution method only works if the two integers are having an addition or subtraction sign in the midst of the terms, right?
For eg, a+b=2 and 2a-b=3
Here it is, a+b=6 and a*b=7
So how to solve it?
 
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