The product (–9) × (–5) × (– 6)×(–3) is positive whereas the product (–9) × ( –5) × 6 × (–3) is negative. Why?
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observe the following formulas:
(i) - × - = +
(ii) + × + = +
(iii) - × + = -
(iv) + × - = -
given,
(-9) ×(-5) ×(-6) ×(-3) = plus ×minus × minus = minus ×minus = plus
(-9) ×(-5) × 6 ×(-3) = plus ×plus ×minus = plus × minus = minus
here, observe only the signs. that's the reason
(i) - × - = +
(ii) + × + = +
(iii) - × + = -
(iv) + × - = -
given,
(-9) ×(-5) ×(-6) ×(-3) = plus ×minus × minus = minus ×minus = plus
(-9) ×(-5) × 6 ×(-3) = plus ×plus ×minus = plus × minus = minus
here, observe only the signs. that's the reason
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