1. If the first term of an A.P is 2 and the common difference is 4, then find the sum of its first 40 terms.
2. Find the discriminant of the quadratic equation 3x2+7x+2=0, hence find the nature of the roots.
3. In the figure, find the length of the tangent PQ if RS=3cm and SP=9cm.

4. Prove that the lengths of the tangents drawn from an external point to a circle are equal.
5. Find the roots of 1/x+6 – 1/x-7 =11/30, X = -4,7
6. The sum of the 5th and 9th terms of an A.P is 40 and the sum of the 8th and 14th term is 64. Find the sum of first 20 terms.
7. Solve by using the formula.2x2-7x+3=0
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Answer:
Ans 1=S40= 3200
Ans 6= S20= 610
Sorry I didn't knew all parts
I knew only 1 and 6
Hope this helps u
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