Упростите:
(2a-[tex] 2\sqrt{7ab} [/tex]+7b)(2a+[tex] 2\sqrt{7ab} [/tex]+7b)
(2a-[tex] 2\sqrt{7ab} [/tex]+7b)(2a+[tex] 2\sqrt{7ab} [/tex]+7b)
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Verified answer
(2a-2√(7ab)+7b)(2a+2√(7ab)+7b)=
=4a²+4a√(7ab)+14ab-4a√(7ab)-28ab-14b√(7ab)+14ab+14b√(7ab)+49b²=
=4a²+49b²
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