Question

Section A slove it please I request you

Answer 1

Answer 1 :-

• (x+3) is factor of given polynomial

$p(y) = x + 3 \\ \\ 0 = x + 3 \\ \\ x = ( - 3)$

Put values :-

${x}^{3} + {3x}^{2} - kx - 3 = 0 \\ \\ {( - 3)}^{3} + 3 {( - 3)}^{2} - k( - 3) - 3 = 0 \\ \\ 27 + 27 - 3k = 3 \\ \\ 54 - 3k = 3 \\ \\ - 3k = 3 - 54 \\ \\ k = 17$

Answer 2 :-

$= \sqrt{72} + \sqrt{800} - \sqrt{18} \\ = \sqrt{36 \times 2} + \sqrt{400 \times 2} - \sqrt{9 \times 2} \\ =( 6 + 20 - 9) \sqrt{2} \\ = 23 \sqrt{2}$

Answer 3 :-

angle A + angle B + angle C = 180°

angle A + angle B + angle C + angle B

= 180° + angle B

65° + 140° = 180° + angle B

205° - 180° = angel B

angle B = 25°

Answer 4 :-

Is attached.

Answer 5 :-

0,1,2,3,4,5,6 is first seven whole numbers.

mean :-

$= \frac{0 + 1 + 2 + 3 + 4 + 5 + 6}{7} \\ = \frac{21}{7} \\ = 3$

Answer 6 :-

Is attached .

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